hemispheric history from 1000 to 1500 A.D., what we will call the Islamic Middle Period, witnessed a steady and remarkable expansion of Islam, not simply as a religious faith but as a coherent, universalist model of civilized life. To be sure, the intense, concentrated, innovative brilliance of the Abbasid Caliphate was not to be repeated in the subsequent half millennium of Islamic history. Yet if many Muslims did turn intellectually conservative by the standard of modern scientific rationalism, the religion nonetheless pushed outward from its Middle Eastern core as an attractive, satisfying, cohesive system for explaining the cosmos and for ordering collective life among ever- larger numbers of people, both sedentary and pastoral, both urban and rural, all across the intercommunicating zone.
The spread of Islam into new areas of the hemisphere during the Middle Period was given impetus by two major forces. One of these was the advance of Turkish-speaking Muslim herdingpeoples from Central Asia into the Middle East, a movement that began on a large scale with the conquests of the Seljuk Turks in the eleventh century. In the ensuing 300 years Turkish cavalry armies pushed westward into Asia Minor and southern Russia and eastward into India. The second force was the gradual but persistent movement of Muslim merchants into the lands rimming the Indian Ocean, that is, East Africa, India, Southeast Asia, and China, as well as into Central Asia and West Africa south of the Sahara.
Yet the principal contribution of both warriors and merchants, establishing in some places Muslim military dominance and in other places only communities of believers under non-Muslim authority, was to prepare the ground for influxes of Muslim religious and intellectual cadres. It was they, over the longer term, who founded the basic institutions of Islamic civilization in these new areas and who carried on the work of cultural conversion among non-Muslim peoples.
A close look at the patterns of travel and migration in the post-Abbasid centuries reveals a quiet but persistent dispersion of legal scholars, theologians, Sufi divines, belle-lettrists, scribes, architects, and craftsmen outward from the older centers of Islam to these new frontiers of Muslim military and commercial activity. At the same time, the members of this cultural elite who were living and traveling in the further regions consistently maintained close ties with the great cities of the central Islamic lands, thereby creating not merely a scattering of literate and skilled Muslims across the hemisphere, but an integrated, growing, self-replenishing network of cultural communication.
Moreover, the most fundamental values of Islam tended to encourage a higher degree of social mobility and freer movement of individuals from one city and region to another than was the case in the other civilizations of that time. Islamic culture put great stress on egalitarian behavior in social relations based on the ideal of a community of believers (the
umma
) having a common allegiance to one God and his Sacred Law. To be sure, a great gulf separated the rich and powerful from the poor and weak, as was the case in all civilized societies until very recent times. But Islam mightily resisted the institutionalizing of ascribed statuses, ethnic exclusivities, or purely territorial loyalties. The dynamics of social life centered, not on relations among fixed, rigidly defined groups as was the case in Hindu India or even, to a lesser degree, the medieval West, but on what Hodgson calls “egalitarian contractualism,”the relatively free play of relations among individuals who tended to size one another up mainly in terms of personal conformity to Islamic moral standards. 13 Consequently, wherever in the Dar al-Islam an individual traveled, pursued a career, or bought and sold goods, the same social and moral rules of conduct largely applied, rules founded on the
shari’a
.
The Islamic world in Ibn